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The reigning champions laid down the gauntlet to Jurgen Klopp's Reds on Saturday evening as Raheem Sterling netted a second-half hat-trick in just 13 minutes and 12 seconds.

The forward completed his treble with a smart finish, but the way the England international opened the scoring brought with it the Premier League's latest offside controversy.

Appearing offside when played in by Sergio Aguero, referee Paul Tierney awarded the goal after lengthy consultation with assistant Eddie Smart after the ball rebounded in off him thanks to Daryl Janmaat's clearance.

"Well, I guess the first question would be like this," Guardiola added.

"My first comment is we won because we deserved to win by far. We were the better team on the pitch.

"Honestly, just in case it's offside, I am sorry. I don't want to do that but I don't know. Really sorry if it is.